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Net Earnings (Loss) Per Share (Tables) | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Calculations of Net Earnings (Loss) Per Share - Basic and Diluted | The calculations of net earnings (loss) per share - basic and net earnings per share - diluted were as follows:
|  | 3 Months Ended |  |  | 9 Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Net earnings (loss) available to common shareholders |  | $ | 10.3 |  |  | $ | 146.1 |  |  | $ | (52.4 | ) |  | $ | 326.9 |
Weighted-average common shares outstanding (in millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding - basic |  |  | 58.2 |  |  |  | 59.9 |  |  |  | 58.4 |  |  |  | 60.2 |
Effect of dilutive securities - stock options |  |  | — |  |  |  | 0.1 |  |  |  | — |  |  |  | 0.1 |
Effect of other share-based awards |  |  | 0.3 |  |  |  | 0.3 |  |  |  | — |  |  |  | 0.3 |
Weighted-average common shares outstanding - diluted |  |  | 58.5 |  |  |  | 60.3 |  |  |  | 58.4 |  |  |  | 60.6 |
Net earnings (loss) per share - basic |  | $ | 0.18 |  |  | $ | 2.44 |  |  | $ | (0.90 | ) |  | $ | 5.43 |
Net earnings (loss) per share - diluted |  | $ | 0.18 |  |  | $ | 2.42 |  |  | $ | (0.90 | ) |  | $ | 5.40 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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